The answer for the fight or flight should be adrenalin(e). That is the name that is used in (most of) the entire word besides japan and the US. It is the original name, named by the guy that isolated the hormone. US uses a different name because of something to do with patenting. (so epenephrine should still remain as an acceptable answer in my opinion)
There are uncountable sources, but I found the next one quite interesting, further down the article. About the discovery and namegiving. I allready knew a bit about it, but it has some interesting facts ( which I find hard to summarize here in englsih so I won't) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1127537/